Nickel Alloy Alloy 602 CA
UNS N06025 · EN 2.4633, NiCr25FeAlY · also Nicrofer 6025 HT, Inconel 602CA / Nicrofer 6025HT
Alloy 602 CA (2.4633, N06025, NiCr25FeAlY) is a Ni-Cr-Fe alloy with aluminium and yttrium additions that form a highly stable, adherent oxide scale, giving high strength and scaling resistance above 1200 °C.
Reference datasheet — Alloy 602 CA is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the SA condition
Alloy 602 CA tempers and conditions
Alloy 602 CA is supplied in 6 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot rolled/forged and solution annealed plate and bar | Heavy plate, forged rings and large bar for furnace rolls, retorts and burner components. | 320 | 740 | 45 | 180 HB | 1.4 % IACS |
SADefault Solution annealed | Standard delivery condition for plate, sheet and bar; best combination of ductility, weldability and creep strength. | 330 | 750 | 45 | 185 HB | — |
Cold rolled and solution annealed strip/thin sheet | Thin gauge (<3 mm) strip and sheet for furnace muffles, radiant tubes and catalyst supports; finer grain gives slightly higher RT strength. | 360 | 780 | 42 | 195 HB | 1.4 % IACS |
As-welded deposit | Properties of GTAW/SMAW joints made with matching filler; no PWHT normally applied. | 390 | 700 | 28 | 195 HB | 1.4 % IACS |
Solution annealed then long-term high-temperature exposed | Reference condition for design checks after service exposure: secondary carbides raise strength but room-temperature ductility falls sharply. | 450 | 800 | 8 | 20 HRC | 1.4 % IACS |
Cold drawn | Choose for straight, close-tolerance bar or wire where higher RT strength is wanted and service temperature stays below the recrystallisation range. | 700 | 900 | 20 | 25 HRC | 1.4 % IACS |
Supply forms, finishes and certifications
Ways Alloy 602 CA is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
TUBE-SA | Seamless or welded tube, solution annealed | Supply form |
What is Alloy 602 CA?
Alloy 602 CA (2.4633, N06025, NiCr25FeAlY) is a Ni-Cr-Fe alloy with aluminium and yttrium additions that form a highly stable, adherent oxide scale, giving high strength and scaling resistance above 1200 °C. Engineers choose it for furnace internals that must keep shape and section at its 1200 °C maximum service temperature; it is stocked as sheet, plate, bar and tube in solution-annealed, hot- and cold-rolled, cold-drawn and aged conditions. The trade-offs are low machinability (score 18) and cold forming that needs roughly 1.5× the force of alloy 600 with high-temperature intermediate anneals. Alloy 601 or alloy 600 are the cheaper alternatives where service stays below about 1100 °C. Alloy 602 CA has a density of 7.9 g/cm³ (0.285 lb/in³), lighter than 92% of nickel alloy grades. It melts at 1,340°C (2,444 °F). Alloy 602 CA has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 750 MPa (109 ksi) — weaker than 67% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 217 GPa (31.5 Msi).
What is Alloy 602 CA used for?
- furnace retorts and muffles
- radiant tubes
- kiln furniture
- ethylene-cracker fixtures
Advantages
- High service temperature — 1,200°C (2,192 °F), better than 99% of nickel alloy grades
- Low embodied carbon — 11 kg CO₂/kg, better than 85% of nickel alloy grades
Limitations
- Hard to polish — 60/100, worse than 84% of nickel alloy grades
Alloy 602 CA properties
Typical room-temperature values for Alloy 602 CA-SA; bars are the position among nickel alloy grades.
Physical3
Alloy 602 CA has a density of 7.9 g/cm³ (0.285 lb/in³), lighter than 92% of nickel alloy grades. It melts at 1,340°C (2,444 °F).
Mechanical13
Alloy 602 CA has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 750 MPa (109 ksi) — weaker than 67% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 217 GPa (31.5 Msi).
Thermal6
Alloy 602 CA is rated for continuous service to 1,200°C (2,192 °F). It conducts heat at 10.4 W/m·K (6.01 BTU/hr·ft·°F), worse than 76% of nickel alloy grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
Alloy 602 CA conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 74% of nickel alloy grades.
Sustainability4
Producing a kilogram of Alloy 602 CA takes about 150 MJ of energy and emits 11 kg of CO₂ — less than 68% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability6
Alloy 602 CA's machinability is poor (18/100, worse than 61% of nickel alloy grades); weldability good (60/100); formability good (55/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the nickel alloy family
Yield strength against density for every nickel alloy grade FabDigit runs. Alloy 602 CA is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Alloy 602 CA
Is Alloy 602 CA easy to machine?
Machine like a hard Ni-Cr alloy: rigid setup, positive-rake carbide or ceramic tooling, low speed with heavy feed, flood coolant and no dwelling — the high-carbide microstructure abrades edges and work-hardens instantly.
Can Alloy 602 CA be welded?
GTAW, PAW and SMAW with matching NiCr25FeAlY (SG/E 602 CA) filler; keep interpass below ~150 °C, low heat input and stringer beads, clean the Al-rich oxide before and between passes, no PWHT normally required.
Can Alloy 602 CA be formed, bent or molded?
Hot work between about 1100 and 1200 °C then solution anneal; cold forming is possible but needs roughly 1.5× the force of alloy 600 with intermediate anneals at 1180–1220 °C.
Alloy 602 CA chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cr | 24 – 26 | 25 |
| Fe | 8 – 11 | 9.5 |
| Alforms adherent alumina sub-scale | 1.8 – 2.4 | 2.1 |
| Cintentionally high for carbide strengthening | 0.15 – 0.25 | 0.19 |
| Ti | 0.1 – 0.2 | 0.15 |
| Yreactive element, scale adhesion | 0.05 – 0.12 | 0.08 |
| Zr | 0.01 – 0.1 | 0.05 |
| Si | ≤ 0.5 | 0.2 |
| Mn | ≤ 0.15 | 0.08 |
| Cu | ≤ 0.1 | |
| P | ≤ 0.02 | |
| S | ≤ 0.01 | |
| Nibalance, typically ≥ 60 % | balance |
What surface finishes work on Alloy 602 CA?
Pickle in HNO₃-HF or grit blast to remove the tenacious Al/Cr oxide before welding or brazing; no anodising — protective service scale is grown in situ by a first firing above 1000 °C.
Surface treatments FabDigit runs on nickel alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Nickel Alloy Alloy 602 CA in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N06025
- EN / DIN / Werkstoff-Nr.
- 2.4633NiCr25FeAlY
- Trade names
- Nicrofer 6025 HTInconel 602CA / Nicrofer 6025HT
How much does Alloy 602 CA cost?
Alloy 602 CA is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Alloy 602 CA — frequently asked
What is Alloy 602 CA used for?
Alloy 602 CA is typically used for furnace retorts and muffles, radiant tubes, kiln furniture and ethylene-cracker fixtures. In short: 1200 °C service capability; adherent Al-Y oxide scale; highest-temperature Ni-Cr sheet grade.
What is the yield strength of Alloy 602 CA?
Alloy 602 CA has a typical yield strength of 330 MPa (47.9 ksi) and a tensile strength of 750 MPa (109 ksi) — weaker than 67% of nickel alloy grades. Strength varies by condition: see the 6 listed tempers.
Is Alloy 602 CA easy to machine?
Not especially — machinability is rated poor (18/100, worse than 61% of nickel alloy grades). Machine like a hard Ni-Cr alloy: rigid setup, positive-rake carbide or ceramic tooling, low speed with heavy feed, flood coolant and no dwelling — the high-carbide microstructure abrades edges and work-hardens instantly.
Can Alloy 602 CA be welded?
Yes — weldability is rated good (60/100). GTAW, PAW and SMAW with matching NiCr25FeAlY (SG/E 602 CA) filler; keep interpass below ~150 °C, low heat input and stringer beads, clean the Al-rich oxide before and between passes, no PWHT normally required.
What surface finishes work on Alloy 602 CA?
Pickle in HNO₃-HF or grit blast to remove the tenacious Al/Cr oxide before welding or brazing; no anodising — protective service scale is grown in situ by a first firing above 1000 °C.
Can Alloy 602 CA be formed, bent or molded?
Hot work between about 1100 and 1200 °C then solution anneal; cold forming is possible but needs roughly 1.5× the force of alloy 600 with intermediate anneals at 1180–1220 °C.
What is the maximum service temperature of Alloy 602 CA?
Alloy 602 CA is rated for continuous use to about 1,200°C (2,192 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Alloy 602 CA-SA and Alloy 602 CA-CD?
SA is the default condition — standard delivery condition for plate, sheet and bar; best combination of ductility, weldability and creep strength. CD: choose for straight, close-tolerance bar or wire where higher RT strength is wanted and service temperature stays below the recrystallisation range. Yield strength is 330 MPa in SA versus 700 MPa in CD.
How much does Alloy 602 CA cost?
Alloy 602 CA is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- VDM Alloy 602 CA / Nicrofer 6025 HT material data sheet No. 4137 — VDM Metals (2020)
- ASTM B168 — Ni-Cr-Fe alloy plate, sheet and strip (UNS N06025) — ASTM International (2019)
- ASTM B166 / B167 / B564 — rod & bar, seamless pipe & tube, forgings — ASTM International (2019)
- DIN 17742 / VdTÜV-Werkstoffblatt 516 (NiCr25FeAlY, 2.4633) — DIN / TÜV (2002)
- ASM Handbook Vol. 13B — Corrosion: Materials (high-temperature Ni alloys) — ASM International (2005)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.